P−C Bond Activation Chemistry: Evidence for 1,1-Carboboration Reactions Proceeding with Phosphorus−Carbon Bond Cleavage
作者:Olga Ekkert、Gerald Kehr、Roland Fröhlich、Gerhard Erker
DOI:10.1021/ja1110283
日期:2011.3.30
at one former acetylene carbon atom and a C(6)F(5) substituent and the remaining -B(C(6)F(5))(2) group at the other. Prolonged thermolysis of 4d resulted in an intramolecular aromatic substitution reaction by means of Ph(2)P attack on the adjacent C(6)F(5) ring to yield the zwitterionic phospha-indene derivative 7. The compounds 4a, 4c, 4d, and 7 were characterized by X-ray diffraction.
一系列 (芳基)(2)PC≡CR(芳基 = 苯基或甲基,R = Ph 或正丙基)类型的二芳基膦基取代的乙炔与强路易斯酸试剂 B(C(6)F(5) ))(3) 在升高的温度 (70-105 °C) 下在甲苯中生成 1,1-碳硼化产物 4. 用 B(C(6)F(5))(3) 处理双(二苯基膦基)乙炔在类似条件下进行膦酰基迁移以产生 1,1-碳硼化产物 4d,在一个前乙炔碳原子处带有一对 Ph(2)P 取代基和一个 C(6)F(5) 取代基,其余的 - B(C(6)F(5))(2) 组在另一个。4d 的长时间热解导致分子内芳香族取代反应,通过 Ph(2)P 攻击相邻的 C(6)F(5) 环产生两性离子磷茚衍生物 7。化合物 4a、4c、4d、